Man, most music gets fucking stale or you realize only later that it was never good in the first place; most eras are populated mostly by crap; you look back and you can see how formulaic most of the shit on the radio was. Its rare that someone's that good, that you can just keep listening over and over. That said, I mean just looking at the charts, 72 has some survivors that might make the cut:
Arlo Guthrie: 'The City of New Orleans' ('cept he don know how to say New Orleans)
https://www.youtube.com/watch?v=TvMS_ykiLiQ
Commander Cody and His Lost Planet Airmen: 'Hot Rod Lincoln'
https://www.youtube.com/watch?v=3R7l7nDuj1o
Mac Davis: 'Baby Don't Get Hooked on Me' (cheesy, I know)
https://www.youtube.com/watch?v=UauHDIlhvTk
Neil Young: 'Heart of Gold'
https://www.youtube.com/watch?v=pO8kTRv4l3o
The Hollies: 'Long Cool Woman' - shit man, that song rocks
https://www.youtube.com/watch?v=3qKOv3VBJcc
Elton John: 'Rocket Man'
https://www.youtube.com/watch?v=FCf23ZTFaDM FUCKING ROCKET MAN (btw I saw Elton in Indianapolis in like 05 - absolutely killer show)
America: 'A Horse With No Name' (call em a Neil knock off if you want to, they never hid that they were inspired by him, nor offended by those taking those shots, and, a song that prolly stands up to time pretty well)
https://www.youtube.com/watch?v=zSAJ0l4OBHM
The Moody Blues: 'Knights in White Satin'
https://www.youtube.com/watch?v=9muzyOd4Lh8
Jim Croce: 'You Don't mess around with Jim'
https://www.youtube.com/watch?v=-4qUXcXuMSE
And, yeah, I admit Brandy still gets airtime.
Neil Diamond: 'Song Sung Blue'
https://www.youtube.com/watch?v=ighSddnnaPE (might have to be a fan, lol)